A Phase I Study of IDH2 Inhibition Using Enasidenib as Maintenance Therapy for IDH2-mutant Myeloid Neoplasms Following Allogeneic Stem Cell Transplantation
A Phase I Study of IDH2 Inhibition Using Enasidenib as Maintenance Therapy for IDH2-mutant Myeloid Neoplasms Following Allogeneic Stem Cell Transplantation
This research study is studying a targeted therapy drug as a possible treatment for IDH2 mutant acute myeloid leukemia or chronic myelomonocytic leukemia while undergoing hematopoietic stem cell transplantation.
The drug involved in this study is:
-Enasidenib.
This research study is a Phase I clinical trial, which tests the safety of an investigational drug and also tries to define the appropriate dose of the investigational drug to use for further studies. "Investigational" means that the drug is being studied.
The FDA (the U.S. Food and Drug Administration) has approved enasidenib as a treatment option for some cancers, but not for the specific indication under study with this protocol.
Enasidenib is currently used to treat AML with an IDH2 mutation that has come back or has not improved after previous AML treatment. This study is examining whether or not enasidenib may be beneficial and well-tolerated as an agent to prevent the relapse of IDH2-mutated AML or other myeloid neoplasms after participants have undergone hematopoietic stem cell transplantation (HSCT). IDH2 is an enzyme that, when mutated, can overproduce metabolites and compounds that contribute to the growth of tumors and cancerous cells. Enasidenib may help block the over production of these substances.
There is an FDA-approved test available to detect IDH2 mutations in patients with AML, but for the purposes of participation in this clinical trial, an investigational test may be used to determine the presence of an IDH2 mutation.
In this research study, the investigators are:
Inclusion Criteria:
Pathologically confirmed diagnosis of IDH2-mutant acute myeloid leukemia (AML), myelodysplastic syndrome (MDS) or chronic myelomonocytic leukemia (CMML).
IDH2 mutations will include any IDH2 R140 or R172 alterations
Eligibility and enrollment will be based on local IDH2 mutational testing performed at any center. The presence of an IDH2 mutation at the time of initial diagnosis or any other time thereafter is necessary and sufficient. The presence of an IDH2 mutation at time of enrollment is not necessary for the purposes of eligibility.
Between the ages of 18 and 75 years
Will undergo first allogeneic hematopoietic stem cell transplantation (HSCT) for their malignancy. Conditioning may have been either conventional myeloablative (MAC) or reduced intensity conditioning (RIC).
HSCT Donor will be one of the following:
ECOG performance status ≤ 2
Participants must have normal organ and marrow function as defined below:
LVEF must be equal to or greater than 50%, as measured by MUGA scan or echocardiogram
Female patients of childbearing potential must have a negative pregnancy test, as measured by serum or urine testing
The effects of enasidenib on the developing human fetus are unknown. For this reason women of child-bearing potential and men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) during the entire study treatment period and through 6 months after the last dose of treatment
Ability to understand and the willingness to sign a written informed consent document
Exclusion Criteria:
Prior allogeneic hematopoietic stem cell transplants.
Evidence of relapsed/recurrent/residual disease as assessed by bone marrow aspirate and biopsy performed within 42 days prior to study entry.
History of other malignancy(ies) unless
Known diagnosis of active hepatitis B or hepatitis C
Current or history of congestive heart failure New York Heart Association (NHYA) class 3 or 4, or any history of documented diastolic or systolic dysfunction (LVEF < 50%, as measured by MUGA scan or echocardiogram)
Current or history of ventricular or life-threatening arrhythmias or diagnosis of long-QT syndrome
Systemic infection requiring IV antibiotic or antifungal or antiviral therapy within 7 days preceding the first dose of study drug, or other severe infection
Known dysphagia, short-gut syndrome, gastroparesis, or other condition(s) that limits the ingestion or gastrointestinal absorption of drugs administered orally
Uncontrolled hypertension (systolic blood pressure [BP] > 180 mmHg or diastolic BP > 100 mmHg)
QTc interval (i.e., Friderica's correction [QTcF]) ≥ 450 ms or other factors that increase the risk of QT prolongation or arrhythmic events (e.g., heart failure, hypokalemia, family history of long QT interval syndrome) at screening
Concomitant receipt of the following sensitive CYP substrate medications that have a narrow therapeutic range (unless the participant can be transferred to other medications at least 5 half-lives prior to the start of study treatment): paclitaxel and docetaxel (CYP2C8), phenytoin (CYP2C9), S-mephenytoin (CYP2C19), thioridazine (CYP2D6), theophylline, and tizanidine (CYP1A2)
Concomitant receipt of the breast cancer resistance protein (BCRP) transporter-sensitive substrate rosuvastain (unless the participant can be transferred to another medication at least 5 half-lives prior to the start of study treatment)
Uncontrolled intercurrent illness that would limit compliance with study requirements.
HIV-positive participants on combination antiretroviral therapy are ineligible because of the potential for pharmacokinetic interactions with study drug. In addition, these participants are at increased risk of lethal infections when treated with marrow-suppressive therapy.